Well, I can't help you write the whole essay, but if you want I can give you some tips!
Answer:
Bebo jugo de naranja. =( I drink an indefinite amount of orange juice.)
Bebo un jugo de naranja. = (I drink a glass / cup / bottle of orange juice.)
The word "un" changes the meaning of a sentence
4. They film internationally
5. Me aburren las películas románticas
6. Javier Bardem
Hope this helps:)